GFB Evo 4-9 Under-Drive Crank Pulley w/ Belt

When you're looking to get a bit more zip out of your Mitsubishi Lancer, especially during spirited driving or track days, reducing the rotating mass in the engine is a smart move. This under-drive crank pulley from Go Fast Bits is designed to do just that, making your engine feel more responsive and eager to rev.

This pulley is machined from a single billet of 6061-T6 aluminum, which is a strong yet lightweight material. By significantly cutting down on the inertia of the factory pulley – up to 85% less rotating inertia – the engine doesn't have to work as hard just to spin itself. This means more of the engine's power can go directly to the wheels, giving you that improved throttle response and a livelier feel, particularly when you're winding the engine out. The under-drive design also slightly slows down the accessories like the alternator, reducing their parasitic drag on the engine without negatively impacting their performance.

This is a direct bolt-on part, meaning it's designed to fit right in place of your stock crank pulley. It comes with the necessary belt, making it a complete package for this upgrade. You can expect a more immediate response when you press the gas pedal, and the engine will feel more willing to climb through the RPM range.